Noibat is a lavender bat-like Pokémon. It has two clawed fingers on each wing and two long toes on each foot. Noibat's hips and chest are covered in black fur. It has large yellow eyes, two purple teardrop-shaped spots on the front of its face, and large teardrop-shaped ears that resemble loudspeakers. When its mouth is open, two pointed teeth can be seen on its lower jaw.
Noibat is capable of emitting ultrasonic waves of 200,000 Hertz from its ears, which it can use to stun large creatures, immobilize prey, and determine the ripeness of fruit it enjoys eating. It also uses ultrasonic waves as a means to communicate with other Noibat.
Noibat has the lowest base stat total of all Dragon-type Pokémon.
In addition, Noibat has the lowest base HP and Attack stats of any Dragon-type Pokémon, and ties with Goomy for having the lowest base Defense among all Dragon-type Pokémon.
Noibat's German name, eF-eM, is the only Pokémon name that uses the Latin alphabet and does not start with a capital letter.
Noibat and its evolution, Noivern, are the only dual Flying-type Pokémon to have Flying as their primary type.
Originally, Noibat's Pokédex entry on the official Pokémon website was incorrect, showing it as a pure Flying-type Pokémon. It has been since rectified.
Noibat can be seen as a parallel to Zubat, as they are both Flying-type Pokémon based on bats and can have Infiltrator as a possible Ability. They also share the same base stats, with their Attack and Special Attack switched around.
Noibat may be based on a bat, and the design of its ears may be based on speakers.